What is Fog Lift?
context - when walking through a swamp the area is foggy,
later in the day when the sun is higher the fog has "lifted"
What really happened?
Fog doesn't really lift. As the sun warms the surface
the warmed ground warms the air, raising the air temperature
above the temperature at which water vapor condenses into a
cloud (fog is just a cloud near the Earth's surface). The sun
can penetrate the early morning fog enough to warm the surface
and create the appearance that the fog is lifting.
Argonne National Laboratory
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Update: June 2012